DESC: The world's best radar detector" just got better! With improved detection range on all radar threats, the Passport 8500 X50 is truly the best detector ever developed by the pros at Escort. The "V-tuned" detector utilizes a state-of-the-art microwave receiver and proprietary software for ultra-high sensitivity on conventional and "instant-on" radar, and offers even more range on K-band and Ka-band